(19)

(11)

EP 1 144 541 A1

(12)

(43) Date of publication: 17.10.2001 Bulletin 2001/42 (21) Application number: 99960114.9 (22) Date of filing: 06.10.1999

(51) International Patent Classification (IPC)7: C09K 7/02 (86) International application number: PCT/US9923/289 (87) International publication number: WO 0020/527 (13.04.2000 Gazette 2000/15)

(84) Designated Contracting States: AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE Designated Extension States: AL LT LV MK RO SI (30) Priority: 07.10.1998 US 168268 (71) Applicant: Phillips Petroleum Company Bartlesville, Oklahoma 74004 (US)	(72) Inventor: PATEL, Bharat, B. Bartlesville, OK 74006 (US) (74) Representative: Dost, Wolfgang, Dr.rer.nat., Dipl.-Chem. et al Patent- und RechtsanwälteBardehle . Pagenberg . Dost . Altenburg .Geissler . IsenbruckGalileiplatz 1 81679 München 81679 München (DE)